Light lens for birding?

I actually came from canon myself, i use a 60-250 for birds im lucky i can get close to them so it fit the bill for me, i dont know about the 55-300 i have been told its slow AF, but other than that it might help you, good luck.

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Alan.It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.Mark Twain